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Ever feel like your eyes are like your car? That you have no idea how it works or what’s happening under the hood, but as long as the engine’s running (or you can see) everything’s A-OK? The eyes are pretty complex — there are seven main parts in the eye that transmit information to the brain, detect light, and focus. Here are some fun facts you may not know about your eyes:

Optic Nerve

  1. The average blink lasts about one tenth of a second.
  2. We blink approximately once every five seconds.
  3. Most muscles and bodyparts take some time to warmup to their full potential but our eyes work at full capacity all the time.
  4. Our eyes heal quickly. It can take as little as 48 hours for our eyes to heal a corneal scratch.
  5. Approximately half the brain is involved in sight.
  6. The optic nerve connecting the eye to the brain has never successfully been reconstructed; as such, doctors have yet to find a way to transplant an eyeball.
  7. The cells in our eyes have different shapes. Cylindrical cells allow us to see shapes, and conical cells allow us to see color.
  8. Heterochromia is when someone has two different colored eyes.
  9. Our eyes have a small blind spot in the back of the retina, where the optic nerve attaches. But we don’t notice because our eyes fill in each other’s blind spot.
  10. The muscles that control our eyes are the most active in our body.
  11. 80% of vision problems worldwide are avoidable or even curable.